from the 2.6.37-0.slh.19 on, aptosid kernel has nouveau support.
from the changelog

Quote:

* update kernel config:
- enable DRM_NOUVEAU && DRM_NOUVEAU_BACKLIGHT
while this is not a sane direction as long as it has an unstable
userspace ABI, Debian/ XSF (#612189) forces us to enable nouveau.
Happy breakage for 2.6.38, 2.6.39, 2.6.40, ..., ∞.

As most people with Nvidia cards are probably not aware, the new free and open source driver Nouveau is already enabled in Aptosid kernels, and does work well for most cards and use cases. So, it's time to finally get rid of the closed source malware, and potentially problematic 3rd party repositories. Here is how to do that:

In KDE System Settings turn all desktop effects off. Remove all 3rd party repositories from /etc/apt/sources.list.d/. Remove all traces of nvidia in: /etc/default/dmakms, /etc/X11/xorg.conf.d/ and /usr/src/.